package item1_09.src.com.company.section1;
/**
 * 建议9：少用静态导入
 *
 */
public class MathUtils{
	//计算圆面积
	public static double calCircleArea(double r){
		return Math.PI * r * r;
	}
	
	//计算球面积
	public static double calBallArea(double r){
		return 4*Math.PI * r * r;
	}
}
